Why should we care about quantum discord?

Aharon Brodutch, Daniel R. Terno

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

Abstract

Entanglement is a central feature of quantum theory. Mathematical properties and physical applications of pure state entanglement make it a template to study quantum correlations. However, an extension of entanglement measures to mixed states in terms of separability does not always correspond to all the operational aspects. Quantum discord measures allow an alternative way to extend the idea of quantum correlations to mixed states. In many cases these extensions are motivated by physical scenarios and quantum information protocols. In this chapter we discuss several settings involving correlated quantum systems, ranging from distributed gates to detectors testing quantum fields. In each setting we show how entanglement fails to capture the relevant features of the correlated system, and discuss the role of discord as a possible alternative.
Original languageEnglish
Title of host publicationLectures on general quantum correlations and their applications
EditorsFelipe Fernandes Fanchini, Diogo de Oliveira Soares Pinto, Gerardo Adesso
Place of PublicationCham
PublisherSpringer, Springer Nature
Pages183-199
Number of pages17
ISBN (Electronic)9783319534121
ISBN (Print)9783319534107
DOIs
Publication statusPublished - 2017

Publication series

NameQuantum science and technology
PublisherSpringer International Publishing AG
ISSN (Print)2364-9054
ISSN (Electronic)2364-9062

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